Otdr Testing Launch Cable

Most otdrs have an auto test function but these functions are not foolproof.

Otdr testing launch cable.

The launch fiber cable helps to negate blind spots or the dead zones of an otdr which occures when there is high launch power or faults near the. Measurement using a launch cable launch cable launch cable otdr 1m patchcord bulkhead reflective event with loss fiber under test start of fut end of fut end of launch cable these reflections will be small if the connectors are clean in good condition clean protect the launch cable connectors 1m patchcord. The launch cable sometimes also called a pulse suppressor allows the otdr to settle down after the test pulse is sent into the fiber and provides a reference connector for the first connector on the cable under test to determine its loss. Let s see how well you understand otdrs.

Fiber ring otdr launch cable connects the otdr to the link under test and relays insertion loss and reflectance of the near end connection. Acquire trace and analyze. Otdrs use the in the fiber to make measurements. The length of the launch and receive cables depends on the link being tested.

Otdrs are always used with a launch cable and may use a receive cable. Attenuation and event deadzones explained make sure that the otdr launch fiber used is of the same core diameter and connector type as the fiber link under test. Otdr testing with launch and receive cable. They are usually connected to both ends of the fiber being tested in order to qualify the front end and the far end connectors using an otdr.

Attach cable to test to end of launch cable. Attach receive cable if used to far end of cable. Options for testing 1. Attach optional receive cable to far end of cable under test.

What is a launch cable used for. This help to avoid variations in loss and distance measurements when testing. Attach receive cable if used to far end of cable. Attach launch reference cable to otdr and to cable plant under test.

Because very long test cables are impractical to transport and use noyes designed coiled lengths of 50 µm multimode 62 5 µm multimode or single mode fiber conveniently packaged in compact rings. Noyes fiber rings from afl are a necessity when testing with an otdr. The launch cable is the link between the otdr test port and the fiber link being tested it is used to stabilize the test pulse and to enable the otdr to recover from transmitting the test pulse in order to see or characterize the first connector of the fiber under test. Using a shorter fiber launch cable may hide the first event within the fiber quickmap s dead zone.

Attach launch cable to otdr. Both a launch and receive cable are needed to measure complete link loss of a fiber with an otdr. Set up test parameters on otdr.